package utils

import (
	"bytes"
	"errors"
	"fmt"
	"net/http"
	"strings"

	"git.nutfactory.org/hoernschen/ActivityPub/config"
)

type ErrorResponse struct {
	ErrorCode    string `json:"errcode,omitempty"`
	ErrorMessage string `json:"error,omitempty"`
	RetryTime    int    `json:"retry_after_ms,omitempty"`
}

func CheckRequest(r *http.Request) (err error) {
	if !strings.Contains(r.Header.Get("Content-Type"), "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"") {
		err = errors.New("Content Type not JSON")
	}
	return
}

func GetContentTypeString() string {
	return "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\""
}

func GetDefaultContext() string {
	return "https://www.w3.org/ns/activitystreams"
}

func GenerateProfileUrl(userId string) string {
	return fmt.Sprintf("%s://%s/%s/", config.HttpString, config.Homeserver, userId)
}

func GenerateInboxUrl(userId string) string {
	return fmt.Sprintf("%s://%s/%s/inbox/", config.HttpString, config.Homeserver, userId)
}

func GenerateOutboxUrl(userId string) string {
	return fmt.Sprintf("%s://%s/%s/outbox/", config.HttpString, config.Homeserver, userId)
}

func GenerateFollowersUrl(userId string) string {
	return fmt.Sprintf("%s://%s/%s/followers/", config.HttpString, config.Homeserver, userId)
}

func GenerateFollowingUrl(userId string) string {
	return fmt.Sprintf("%s://%s/%s/following/", config.HttpString, config.Homeserver, userId)
}

func GenerateLikedUrl(userId string) string {
	return fmt.Sprintf("%s://%s/%s/liked/", config.HttpString, config.Homeserver, userId)
}

func GetAccessToken(r *http.Request) (token string, err error) {
	token = r.URL.Query().Get("access_token")
	if token == "" {
		token = r.Header.Get("Authorization")
		if token == "" || !strings.Contains(token, "Bearer") {
			err = errors.New("Missing Token")
		} else {
			token = strings.Split(token, " ")[1]
		}
	}
	return
}

func HandleHTTPError(res *http.Response) (err error) {
	buf := new(bytes.Buffer)
	buf.ReadFrom(res.Body)
	err = errors.New(fmt.Sprintf("%s (%s)", buf.String(), res.Status))
	return
}

func RemoveDuplicates(array []string) []string {
	keys := make(map[string]bool)
	list := []string{}

	for _, entry := range array {
		if _, value := keys[entry]; !value {
			keys[entry] = true
			list = append(list, entry)
		}
	}
	return list
}